Press-rolling process for producing a metal tubular product

Details Press-rolling process for producing a metal tubular product Press-rolling process for producing a metal tubular product

1981-04-20

1984-06-26

Crane, Daniel C.

Metal deforming

With cleaning, descaling, or lubrication of work or product

Lubricating

72209, B21B 1710

Patent

active

044558490

ABSTRACT:
In a press-rolling process for producing a metal tubular product, which comprises a pipe-forming procedure in which a square metal billet is fed into a rolling mill which consists of a pair of pressing rolls which have semi-circular grooves forming circular shape and which is provided with a plug held in the center line of the circular shape, according to the present invention, the press-rolling process is characterized in that a cavity is formed in the center portion of the forward surface of the billet before the pipe-forming procedure, the diameter of the cavity corresponding to 70% or more but less than 100% of the diameter of the plug and the volume of the cavity being equal to or more than the volume of a portion of the plug located in the inserting side of the billet from the axial center of the rolling mill.

REFERENCES:
patent: 2791924 (1957-05-01), Sawyer
patent: 3391561 (1968-07-01), Calmes
patent: 3818733 (1974-06-01), Cauley et al.
patent: 4006618 (1977-02-01), Yanagimoto et al.

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